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They work best when they are part of a daily routine

[DOI] [PubMed] [Google Scholar] 22.Edmonson C., Ziats M.N., Rennert O.M

[DOI] [PubMed] [Google Scholar] 227.Yu G., Xiao C., Lu C.-H., Jia H.-T., Ge F., Wang W., Yin X.-F., Jia H.-L., He J., He Q.-Y

It's not always the case, but I would have expected something as well as an unmeasurable B12

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